10-26 Exercise 3: Find roots of a quadratic equation

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Write a program to find roots of a quadratic equation

A quadratic equation is a second order equation having a single variable. Any quadratic equation can be represented as where a, b and c are constants ( a can't be 0) and x is unknown variable. 

寫一個找二次方程的求根程式

For Example

 is a quadratic equation where a, b and c are 2, 5 and 3 respectively.

To calculate the roots of quadratic equation we can use below formula. There are two solutions of a quadratic equation.

使用下列公式:

x = (-b + sqrt(D))/(2*a)
x = (-b - sqrt(D))/(2*a)

where, D = (b*b-4*a*c) is Discriminant (判別式), which differentiate the nature of the roots of quadratic equation.

For the complex result (複數根):

realPart = -b/(2*a);
imaginaryPart =sqrt(-D)/(2*a);

Note: We have used sqrt() function to find square root which is in math.h library.

 

Example input 1:

1 2 1

Example output 1:

Roots of 1.00x^2 + 2.00x + 1.00 = 0 are real and same
x1 = x2 = -1.00

 

Example input 2:

1 -3 2

Example output 2:

Roots of 1.00x^2 + -3.00x + 2.00 = 0 are real and different
x1 = 2.00
x2 = 1.00

 

Example input 3:

1 2 2

Example output 3:

Roots of 1.00x^2 + 2.00x + 2.00 = 0 are complex and different
x1 = -1.00+1.00i
x2 = -1.00-1.00i
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We will continue this question in few days
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Everything is fixed. Enjoy your time with The Judge :)
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ANNNNNNNNNNNNNNNNNNNNNNNNNNGRYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY
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Your code has newline at the end sometime. You learned this lesson many times!
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After i correct the newline in my code,there is still wrong output.However,I had run the program in Codeblocks.The output is still as well as the result. Seeking for help.
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your output lack of 1 space at line 8 when print out "Roots of ...". Please be careful with all small details when working with online judge
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Hidden content!
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prog.c: In function 'main':
prog.c:9:16: warning: implicit declaration of function 'sqrt' [-Wimplicit-function-declaration]
     x1 = (-b + sqrt(D))/(2*a);
                ^~~~
prog.c:9:16: warning: incompatible implicit declaration of built-in function 'sqrt'
prog.c:9:16: note: include '<math.h>' or provide a declaration of 'sqrt'
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Hidden content!
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Hidden content!
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#include<stdio.h>
#include<stdlib.h>
#include<math.h>

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}
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Hidden content!
#include<stdlib.h>
#include<math.h>

int main(void)
{
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}
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prog.c: In function 'main':
prog.c:8:11: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     while(scanf("%lf %lf %lf", &a, &b ,&c)==3)
           ^~~~~
prog.c:8:11: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:11: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:18:17: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
                 ^~~~~~
prog.c:18:17: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:18:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:17: warning: incompatible implicit declaration of built-in function 'printf'
                 printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf",a,b,c,x1,x2);
                 ^~~~~~
prog.c:21:17: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:29:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:29:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:34:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf",a,b,c,x1);
             ^~~~~~
prog.c:34:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:41:13: warning: incompatible implicit declaration of built-in function 'printf'
             printf("Roots of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
             ^~~~~~
prog.c:41:13: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main(void)
{
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 **   *****   * * * * * ** *** **  ******   *** *    ********  ****** ***** (-b-spD)/(2*a);
 ** **** **  *   **** *       *  *  ****   * *** **   **   ***   **   * * * ****  * (x1==x2){
  *  **  *   *  *  ***  * *** * *** * * ** *  *  *   **  * *  ** **  *  ** ***  * *** *  *     ****  * * *   ** ** ** ****  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
 ****  ** * * *      ***  ** *****  *** *    * * *  * **   *** * ** **  ** 
**  **  **  ** * *   *  * *** ** ** ** *  **  ****  *** *   *  *    ***  ** **  **  ****  {
*  ****  * *     *    ***** ** *    *** *** ***  * *  *     ***** *   * * *** ***     ** ***   **** *  *****    * *   ** **  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and different\nx1 = %.2lf\nx2 = %.2lf\n",a,b,c,x1,x2);
   * **** **   ***   *   * **  *** **  * ** *   ** ***** * ****    ** * **   * * 
**  *  *  *  **    **  * * **  *   ****  **** * ***
  **** *** *   ** * * ** ** **    ****   **  ***   ** * * if(D==0)
   **    *  ** ****      *   *  *  ***  **   * * *     *****
***    *     * **  *       *     ** ***   **  * * * **** ***     *  *  ***   *     (-b)/(2*a);
 ****       ***  * *     * *  ***** * * * *  * **  **     * * ***** *       **  *
** ** **   * * ***   **** *  *   *    ** * *** *   **    ******   ***  * ** **
 * * * *  ** *** ** * * **        **    ** **    *** * * *** * ******   * ***  **    * * ****** *** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
  * *    ****** * ***   **** ** *** *** *  ** * * **   **    ** ** * *  
    ** * *  ** ****   * * **** * **  * *** ** ******    * *******   * *  *   ***
 * **    * *** **    * *** *** ** **  ** **** *** ** * ****  * ******   * *  *   * * *  
*  ** **** *      *** *  * **     * *   **  ** *** *  ***   *      **   * *
*  **** *  * ** *   * * ** *  *    * **  **   * *     *** * **    *  * ** * * **  **** *  *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = %.2lf\n",a,b,c,x1);
    * * * *  * *  * *   ***  *  ***** *     *******    *   *** ** *    * *
*   ***   *   * * * *    *  * *  **   * * *    ** * * 
*   * ****  * *        **    *** *** * * *  * * *   *  if(D<0)
 **   * * ****    *   *   ** *      ***  **  *  *    
 **             * *** * * *** **    * * ***  ** *  *    *   *** ****   ***    * *** *  (-b)/(2*a);
*  *     ****  *       * ******** * *    * * **  ******** ****  * **   ** *     *  -x1;
  * ** * ** ***** *** * * * ***   *   *  * *    *   ***  **** * * *   ***   * * * *      **   of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and different\nx1 = %.2lf+%.2lfi\nx2 = %.2lf%.2lfi",a,b,c,x1,x2,x1,x1);
* **** *  ****  * *   * *      * * **** ** *   * *  *  
  ** * ** ***   ** ***   * *
    
***    * * *** ****  ** *** **   *   **  *  *   *   ** * 
    *  **** *  * **** *   * **  ** 0;
}
answered by (-249 points)
0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
*****   **** *  ** * *
 *  *  **  ******  **
**  * *     * ** **
int  ***
 ****** *    ** * ****  * **  *** *  a, b, c, D, spD, x1, x2;
   * * *  *****  *     *    
****** ** *  ** ** **  * ** *** **   *   %lf  **   **  *    *** &b   **  **** ** 
* * *   {
  * *  *  ***  * *  ***  **  ***  * *  *  * ** ****  **    * - (4*a*c);
  * * *  * *  ** * *** ** * * * *   *  *  *  ***  * ** * * 
 *          *  ** *
*  * *       {
****     **  *     *  * **   * *     *      * ** *  *  *     **  **      **  
* * *       ****   *      ***      ***  *  *  **   *   **  ***   x1=    ** *** *
  * * *  * * * *  ****** * * *      ****** *  ** **  **   *  *   x2=   * ***  **
*  * *   * *** *  * * ** ** *   ** * ******   ***  ***  * *  *   if (x1==x2){
 **    **** * *  *  *  * ** * * **   * *   ****     * **   *       **** * **  **  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  * ** ****   *  
 * ****   * ****** * *     ** *  *****  ***  * *** *      ** *        *   **** * **   
****** ** ***  * *** *  **  ******  ******     * ****  * * **    else {
 ** *  **   ***  **    *   *     *   ** ***  ** * ***   *** *  ** * ***** *    *    ***    *   * *****   ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and *****     = %.2lf\nx2 =   ****  * ** *** * **
 *  ** * ***   *** *  ** * * ** *   ** *          **** **** *** * *  * }
* **     ** ** *    * ****   *      ** *  * *   * 
 * **      *     *** **  ** **** *  ******  * ** ** *   if(D==0)
 ******     *    **       {
*   *****  **  * ***   * **** * ***  ***  *     * *** * *  * * ** ** **  * * ******** ****  *****
  * ** *  *  **** * *   * * * *   *  *  *  *    * * * ****  * *    *      ** *   * *
 ** ** *                {
 **** *  **  ** **   ******    * ** *** * * **  **  ******* * * * * * ********* ***  ** *   ** ** of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 =  *    ** *  *  **** * 
 * *  *** * * ***   **  **** ******* ***** ***     *  **   *  ** * ** ** *****  **
****  *  *  * *   * **** *  *  *  *    ** **** *     *** *  *    *  * ** *** *   
*     *      ****     *** *  *  ** *   * ***** *   *  * *  *** *** *    **    **    
 *******           {
   * *  ****** *   *  *  *** *     * ** * **  ***  * **  *   * * ** *  ** *  *          ***  *  of %.2lfx^2 + %.2lfx + %.2lf = 0 are real and same\nx1 = x2 = *****  **   ** *****
** * ******* **  *** * *        ********      ** ** * *    *  *** *  ***** * * *
*  ***** ***   * **  * ***        **     ******* * ***** *  
* ****    *  **** **   *    * ** **     ***** *  *    ***  ***   *** 
**    *        * ** *   
            x1= * * * *
 *   *       *       *  * *  ** x2= -x1;
***  **   *    *  ** **  *  * * ** ****      **     *  ***** ** **  ***     *  ** ** ** * * of %.2lfx^2 + %.2lfx + %.2lf = 0 are complex and       *** = **** ***   * = * * *   *  *****   *** *   ** 
*  **  *  ***** *** *      ***** *       *       *  ****** 
 *  *  * **      **  * *** * * *
** *      **  * *** * *  
****  *  *       *  *** *  **   **   *** *      *   * *
 ** *****   *   **** **  *     *   ** 0;
}
answered by (-249 points)
0 0
/tmp/ccvUqbC2.o: In function `main':
prog.c:(.text+0x6e): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Correct output
Case 3: Wrong output
commented by (4.3k points)
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Hidden content!
*  **   **        
     * * ***   ***   **
int main(){
**   ** *** *  ** ** * ***** **   a,b,c;
 * ***** ******** * *   **     * **  D;
*** *  *      * **** ****   ** ** *** * ** %lf ** *** **   ** **** ****** *** 
*** ***** * ***   * **  ** **   *  *   - 4*a*c ;

** **  **    **  * ** *  ** ***  ** * * of %.2fx^2 + %.2fx + %.2f = 0  ** *   **  *   

*  **  ** *   ** *  *   * * * ***   * 
**** **** *   **  *   ** *****  ** *** ****  *** * * *** ****   *   complex and ****** *  *  **
* * *    ***  * * ***  * ****   ** *  *  *** * *****  *  * *    * **** = *  * **  ***    (-b) / (2*a) ), sqrt(-D) / (2*a) );
* ** *****   ** * *******  * **    *   **  ** ** * *  ** *  * **  = * **** ** (-b) / (2*a) ), sqrt(-D) / (2*a) );
* *  *          **     **
****     *****    *** **  *   * ** if(D==0){
* *  *  * *  ** ** **** ***** *  *  **  * ***    * **   * * ***  *** real and same\n");
** ***  ** *** *  *******    *   *      **** *** ** * * ** ***  = x2 = %.2f",( (-b) / (2*a) ) );
 **** * **  ** ** *  *  *** *** 
**  * **    * *   ***** *  ***  ***    
*    * *****  *     ****** ***     ** ***** **  * *  **  *    **   real and *      **    **
  **      * **  *  ***  *  **  **  ***   *** ***** *  * * = %.2f\n",( ((-b) + sqrt(D)) / (2*a) ) );
   *** ******  ********** **  * *   *     ***  *****   **    ** ** *  = %.2f", ( ((-b) - sqrt(D)) / (2*a) ) );
 * * * *  ****   *  *    

** *  * *    *   **********  * 0;
}
answered by (-116 points)
0 0
/tmp/cc8OPUJA.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccLeUfQ5.o: In function `main':
prog.c:(.text+0x51): undefined reference to `pow'
prog.c:(.text+0xdd): undefined reference to `sqrt'
prog.c:(.text+0x13f): undefined reference to `sqrt'
prog.c:(.text+0x213): undefined reference to `sqrt'
prog.c:(.text+0x26a): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
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Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
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Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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Hidden content!
#include    * *  * *  *  **
#include <math.h>
int main()
{
   ** *  *  *****    ***   ***  a,b,c,x,y,d;
 *  **** ** **  ***  ** *  ****  *  %f  * *    ****  *  * **    
* **   *     * * ** *  ** ***  *   *
 * *  ***  * *   ** ***        * **    
** ***  *** * * ***** ****    * **       
* *     **  * *  **   **  ***  (d>0){
*  * *** *  *  ** *** *         ** *  *** of %.2fx^2 + %.2fx + %.2f = 0 are real and  **  ** * * *  *  *
 ****  *    *  *      ***    ** *   * = %.2f\nx2 = %.2f",x,y);
      *** * *   * *** ***  *** ****
 **    *   **       **  *** * if (d==0){
    *** ***  *   **   *  * ***** **  ** * * of %.2fx^2 + %.2fx + %.2f = 0 are real and   **  **    *  * 
 **   **   *  *  * * **  ** * *    = x2 = %.2f",x);
**** *** * ***  **   *****  
**   ***    * ** ** *  *  
 ** ** ** ****  ** * *  *    *  **
   ** **     *  * **  ** *******  *** *  * *  of %.2fx^2 + %.2fx + %.2f = 0 are complex and * * *   ***   **  ** 
   *  *  ** *   *  *     *    * *** 
*   * ********** * ** *   *** ********  ***     = * **  *** *    **** 
* * *       **  ** ***  **  ** ***   = *** ***   * ** * ***
** * ** *    ****   ** *  *** 

* ** ***  **  ** * ** * **   **  0;
}
answered by (54 points)
1 0
/tmp/ccheVQNV.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
/tmp/ccJPGNPl.o: In function `main':
prog.c:(.text+0x87): undefined reference to `sqrt'
prog.c:(.text+0xd5): undefined reference to `sqrt'
prog.c:(.text+0x21f): undefined reference to `sqrt'
collect2: error: ld returned 1 exit status
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
Case 3: Wrong output
commented by (4.3k points)
0 0
-----------Re-judge-----------
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
Case 3: Correct output
commented by (4.3k points)
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